they will be sent to the mandela family in south africa. >>president obama and the first lady left for south africa this morning. where a huge memorial for nelson mandela is planned for tuesday. >> catherine: at least 90 world leaders will attend. former presidents bill clinton, george w. bush and jimmy carter will be there. >> catherine: so will prince charles, oprah, -- and the pope. and if organizers have their way -- it will 'not' be a somber experience. but a big loud and happy event - like the spontaneous street celebrations happening today in south africa. >> catherine: the service will be in the huge soccer stadium which hosted the 20- 10 world cup. it's also the place where mandela gave his first speech after being released from prison. today security sweeps and other final preparations were being made. >> catherine: about 90- thousand citizens will be allowed to attend - on a first come, first serve basis. there will be no tickets. mandela spent 27 years in prison before becoming his country's first black president. he died thursd